London particular is a thick pea soup which takes its name from the name of the air pollution type of dense smog, for which London was famous in the first half of the last century until the Clean Air Act. The thick yellow smog was called Pea soup, or a pea souper. An 1871 New York Times article refers to "London, particularly, where the population are periodically submerged in a fog of the consistency of pea soup...". The soup is made from bacon stock, ham and dried peas and is traditionally served with croutons.
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The London Particular, www.deliaonline.com
Pea soup fog, www.wikipedia.org
Pea soup, www.wikipedia.org